DX58SO + OC - Intel makes great CPUs but lack luster MOBOs especially with non-spec settings including OC. Don't use any kits less then 1.50v nor pseudo 'kits' of 4 individual sticks the chances of them running at Rated combined is very low.
Keep in mind I'm looking at 'cheap' for you but my personal preference is 1.65v DDR3 when using the i7-9xx when running DDR3 1600 or faster. Out of the 'budget' bunch 2 kits of Mushkin Enhanced Blackline Model 996776 would be a good choice; remember "High Probability to run Rated" as spec'd below.
I did check and the DX58SO can support DDR 1600 and since it has an oddball DIMM configuration it only makes sense to get a matched 4x4GB set.
Putting together (2) Kits running at DDR 1600 is a hit or miss, and often the outcome is the necessity running them at DDR3 1333 to keep them stable. The following two have had a good success rate when combined to run at Rated.
X58 = Tri Channel, but your MOBO is 3 + 1; running 3 + 1 does, in your case, maximize the 'Total RAM,' but it also kills the Tri Channel benefits. IMO if the goal is MORE then 4X4GB makes the most sense, of if the goal is 1~2+% faster a Tri Channel matched set e.g. http://www.newegg.com/Product/Productcompare.aspx?Submi...|20-226-194^20-226-194-TS%2C20-226-100^20-226-100-TS%2C20-233-146^20-233-146-TS
I have my doubts the F3-12800CL9D-8GBSR2 DDR3 1600 @ 1.25 and the X58, and I wouldn't be at all surprised if you have problems: Post failures and BSOD. I know it's okay with the LGA 1155 in XMP and or with the low voltage.
What you need is just 4GB of RAM to run most of everything today even the best game on the market.... http://www.bestbuy.com/site/Kingston+Technology+-+Hyper...
With this RAM, you can Easily OC it because your overclocking your CPU and also I got a set of it right now with my SaberTooth X58 + i7-950 and the RAM can OC to 2009MHz at 9-10-9-24, For your OC, set it at 183 BCLK with 21X and set RAM at 2013 at 9-10-9-24 at 1.6v(Not 1.65v) and your set to roll... Also, you can buy 3 set of the RAM in the link i posted because you'll be amazed how it performs LOL...